VirScan (IMAGE) Howard Hughes Medical Institute Caption VirScan detects the history of viral exposure from a single drop of blood. Credit G. Xu et al./<em>Science</em> 2015 Usage Restrictions Must use credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.